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Gevey has released the Ultra 5.1 to unlock the GSM iPhone 4 on iOS 5.1. The new version supports the following modem versions: 01.59, 2.10, 3.10.1, 4.10.1, 4.11.08, and 4.12.01.

The new GEVEY Ultra unlocks your GSM iPhone 4 running iOS 5.1 and earlier and now supports modem firmware versions 1.59, 2.10, 3.10.1, 4.10.1, 4.11.08, and 4.12.01. Currently, a tethered Jailbreak is available for iOS 5.1 for iPhone 4, and you will also need to install the latest Furious Mod file for proper operation.

iH8sn0w has released new version of popular jailbreak utility Sn0wBreeze 2.9. Sn0wbreeze is used to create a custom firmware with jailbreak and preserve iPhone modem (baseband) version for unlock. New version 2.9 adds support for untethered iOS 5.0.1 jailbreak as well as support for all firmwares supported by previous versions of sn0wbreeze.

UPDATE: Apple latest firmware is iOS 5.1.1. Apple has stopped signing all other firmwares, including iOS 5.0.1, iOS 4.3.3 and iOS 4.3.5. This means you can NOT restore to 5.0.1/4.3.3/4.3.5 any more (both original and custom), unless you have saved your SHSH keys for it.

If you have decided to perform an untethered jailbreak and unlock, you need to get the following information:

What type of device do you have (iPhone 3G/3GS/4, iPod Touch 3G/4G, iPad 1/2, Apple TV)?

Do you need unlock (if your iPhone locked to one carrier and you want to use it with another)?
The answer is NO, if the device is not iPhone, if it was purchased as factory unlocked and can be used with any cellular carrier (f.e. in Canada, France, etc).
If the answer is YES, you need to find out your modem version (Setting-General-About-Modem).

What firmware version do you have? Take a look at Setting-General-About-Version. For example it could be iOS 4.3.3.

What operating system do you use on your desktop (Windows, Mac OS)?

How to perform jailbreak, when you do NOT need an unlock

For iPhone 3G the latest is iOS 4.2.1. You can perform jailbreak with any utility. For iOS 4.2.1 you can also use them or GreenPois0n (Windows, Mac OS).

iPad 2 jailbreak is available only for iOS 4.3.3 via JailbreakMe and and iOS 5.0.1 via Absenthe.

If you have saved SHSH keys for iOS 4.3.3 you can use PwnageTool (Mac OS) or Sn0wBreeze (Windows).

iOS 4.3.4/4.3.5

For iOS 4.3.4/4.3.5 only tethered jailbreak is possible with redsn0w. Tethered means that each time you restart your device you will have to connect it to a computer and run redsn0w. The untethered iOS 4.3.5 jailbreak is possible only for iPhone 3GS with old bootrom. You can detect your bootrom version using this tutorial.

iOS 5

To jailbreak and unlock iOS 5 use latest version of redsn0w 0.9.9 or sn0wbreeze 2.8. You can jailbreak tethered or semi-tethered.

The untethered iOS 5 jailbreak is possible only for iPhone 3GS with old bootrom. You can detect your bootrom version using this tutorial.

iOS 5.0.1

For iPhone 4/3GS, iPad 1, iPod Touch 3G/4G an untethered jailbreak is available for iOS 5.0.1. For untethered jailbreak use the latest redsn0w 0.9.10 or Corona – package from Cydia to untether currently installed tethered jailbreak.

Tutorial how to untether installed tethered jailbreak is available here.

For iPhone 4S and iPad 2 use Absenthe.

For tethered iOS 5.0.1 jailbreak you an use redsn0w 0.9.9 and sn0wbreeze 2.8.

iOS 5.1 / iOS 5.1.1

For now only tethered jailbreak is available for iPhone 4/3GS, iPad 1 and iPod Touch 3G/4G for iOS 5.1 and iOS 5.1.1.

We are receiving more and more questions about JailbreakMe supporting particular iOS version and device. Here is a useful table that shows which firmwares can be jailbroken by JailbreakMe and which are not supported. Take a look: